Which of the following is true about the J1772 standard control pilot terminal pin's function?

The J1772 standard control pilot terminal pin plays a crucial role in the communication between the Electric Vehicle (EV) and the Electric Vehicle Supply Equipment (EVSE). One of its key functions is to define the state of the EVSE, which involves signaling different modes such as charging readiness, charging in progress, and error states. This communication ensures that the EV knows when it can safely charge.

Moreover, the control pilot uses a +12V to -12V AC square wave signal to convey different information through pulse-width modulation. This signal can indicate various levels of current available for charging and other operational states.

The control pilot's ability to change the state of the EVSE according to the voltage present is also essential. For example, changes in the voltage levels can communicate whether the EV is connected properly or if there is any issue that requires attention.

Thus, all the statements relating to the J1772 standard control pilot terminal pin's functionalities are accurate, which is why the correct answer encompasses all the mentioned points.